Self-standing films (45 μm thick) of native cellulose nanofibrils (CNFs) were synthesized and characterized for their piezoelectric response. The surface the microstructure evaluated with image-based analysis scanning electron microscopy (SEM). measured dielectric properties at 1 kHz 9.97 GHz indicated a relative permittivity 3.47 3.38 loss tangent tan δ 0.011 0.071, respectively. used as functional sensing layers in sensors corresponding sensitivities 4.7-6.4 pC/N ambient conditions. This...

Composite films consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) and graphene oxide (GO) were electrochemically polymerized by electrooxidation EDOT in ionic liquid (BMIMBF4) onto flexible electrode substrates. Two polymerization approaches compared, the cyclic voltammetry (CV) method was found to be superior potentiostatic for growth PEDOT/GO films. After deposition, incorporated GO reduced rGO a rapid electrochemical repetitive cathodic potential cycling, without using any reducing...

Some bacterial strains such as Komagataeibacter xylinus are able to produce cellulose an extracellular matrix. In comparison wood-based cellulose, (BC) holds interesting properties biodegradability, high purity, water-holding capacity, and superior mechanical structural properties. Aiming toward improvement in BC production titer tailored alterations the film, we engineered K. overexpress partial complete synthase operon that encodes activities for production. The changes cell growth, end...

The ongoing revolution of touch‐based user interfaces sets new requirements for touch panel technologies, including the need to operate in a wide range environments. Such panels endure moisture and sunlight. Moreover, they often be curved or flexible. Thus, there is technologies suitable, example, home appliances used kitchen bathroom, automotive applications, e‐paper. In this work, development transparent flexible moist environments reported. A piezoelectric polymer, poly(vinylidene...

Harvesting micropower energy from the ambient environment requires an intermediate storage, for which printed aqueous supercapacitors are well suited due to their low cost and environmental friendliness. In this work, a systematic study of large set devices is used investigate effect process variability operating voltage on performance stability screen supercapacitors. The current collectors active layers with graphite activated carbon inks, respectively, NaCl as electrolyte. characterized...

Abstract DNA origami nanostructures have tremendous potential to serve as versatile platforms in self-assembly -based nanofabrication and highly parallel nanoscale patterning. However, uniform deposition reliable anchoring of often requires specific conditions, such pre-treatment the chosen substrate or a fine-tuned salt concentration for buffer. In addition, currently available techniques are suitable merely small scales. this article, we exploit spray-coating technique order resolve...

Dielectrophoresis can potentially be used as an efficient trapping tool in the fabrication of molecular devices. For nanoscale objects, however, Brownian motion poses a challenge. We show that use carbon nanotube electrodes makes it possible to apply relatively low voltages and still achieve high enough field gradients for e.g., single molecules. compare efficiency other characteristics dielectrophoresis between lithographically fabricated metallic electrodes, case DNA The results are...

Dielectrophoretic trapping of six different DNA fragments, sizes varying from the 27 to 8416 bp, has been studied using confocal microscopy. The effect length and size constriction between nanoscale fingertip electrodes on efficiency have investigated. Using finite element method simulations in conjunction with analysis experimental data, polarizabilities fragments calculated for frequencies. Also immobilization trapped hexanethiol- DTPA-modified 140 nm long end gold nanoelectrodes was...

Free-standing biodegradable films were fabricated by mixing cellulose nanocrystals and nanofibers with a water-based chitosan solution. The piezoelectric sensitivity of the was measured to find out their suitability in sensing actuation applications. Also structure evaluated scanning electron microscopy. Our initial results show that simple solvent casting method can be used prepare varying properties. composite noticed have phase-separated layered structure, resulting an interesting...

A printed energy harvesting and storage circuit powered by ambient office lighting its use to power a display is reported. The autonomous device composed of three electronic components: an organic photovoltaic module, carbon-nanotubes-only supercapacitor electrochromic element. Components are fabricated from safe environmentally friendly materials, have been using solution processing methods, which translate into low-cost high-throughput manufacturing. made spray-coated carbon nanotube based...

We present a detailed study on the influence of sonication energy and surfactant type electrical conductivity nanocellulose-carbon nanotube (NFC-CNT) nanocomposite films. The was made using minimum amount processing steps, chemicals materials, to optimize properties free-standing flexible In general, NFC-CNT film preparation process is sensitive concerning dispersing phase CNTs into solution with NFC. our study, we used carry out in presence surfactant. final phase, films were prepared from...

The dielectrophoresis method for trapping and attaching nanoscale double-stranded DNA between nanoelectrodes was developed. gives a high yield of single or few molecules only which enables transport measurements at the molecule level. Electrical conductivity individual 140-nm-long measured, showing insulating behavior in dry conditions. In contrast, clear enhancement observed moist conditions, relating to interplay conformation their conductivity.

We present a study of electronic transport in short (12-base-pair) DNA duplexes covalently bonded (via thiol groups) to two gold electrodes obtained by mechanically controllable break junction (MCJB) technique dry conditions. A large number junctions have been repeatedly formed order obtain conductance histogram that reveals peak which corresponds the single molecule. observed conductivity increases upon increasing content G:C base pairs duplex. With our method we are able reliable value and...

Point-of-care devices that are inexpensive, disposable, and environmentally friendly becoming increasingly predominant in the field of biosensing biodiagnostics. Here, microfluidics is a suitable option to endow portability minimal reagent material consumption. Nanocellulose introduced manufacture microfluidic channels as storage immobilization compartment glucose oxidase. Improved enzymatic activity retention demonstrated simple disposable point-of-care diagnostic unit able detect from...

Abstract Bacterial cellulose (BC) is a biodegradable polymer that benefits in purity, crystallinity and superior optical, structural mechanical properties. Such properties facilitate BC to replace the conventional non-biodegradable materials used, for instance, sensing applications. However, production largely conducted medium containing model substrates complex carbon-containing compounds. Aiming towards of eco-friendly piezoelectric-responsive films, we isolated characterized novel...

Recently, the hydrogel-forming polysaccharide gellan gum (GG) has gained popularity as a versatile biomaterial for tissue engineering purposes. Here, we examine modification strategies suitable GG to overcome processing-related limitations. We emphasize thorough assessment of viscoelastic and mechanical properties both precursor solutions final hydrogels. The investigated include purification, oxidation, reductive chain scission, blending. correlate polymer flow hydrogel forming capabilities...

The sensor characteristics of piezoelectric polyvinylidenefluoride (PVDF) sensors with solution-processable electrode materials were studied. electrodes solutionprocessed on 28-μm-thick PVDF film. Two graphene-based printable inks, ink-jet, and screen formulated ink, used. Sensors evaporated metal used as a reference to compare the properties novel structures. studied here sensitivity, nonlinearity, hysteresis, effects frequency temperature. sensitivity measurements revealed mean...

We report a flexible energy harvesting circuit fabricated by roll-to-roll compatible, solution-processable methods. The incorporates supercapacitor from viscous carbon nanotube dispersion, printed Schottky diodes, and piezoelectric element. Used low-temperature materials enabled component integration on poly(ethylene terephthalate) substrate. was built with paper separator an aqueous NaCl electrolyte. Together carbon-based electrodes, these translated into disposable environmentally safe...